EP0606245A1 - Prothese femorale - Google Patents

Prothese femorale

Info

Publication number
EP0606245A1
EP0606245A1 EP92918636A EP92918636A EP0606245A1 EP 0606245 A1 EP0606245 A1 EP 0606245A1 EP 92918636 A EP92918636 A EP 92918636A EP 92918636 A EP92918636 A EP 92918636A EP 0606245 A1 EP0606245 A1 EP 0606245A1
Authority
EP
European Patent Office
Prior art keywords
stem
taper
prosthesis
femoral
femoral stem
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92918636A
Other languages
German (de)
English (en)
Other versions
EP0606245B1 (fr
EP0606245A4 (fr
Inventor
Matthew Lyons
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Exactech Inc
Original Assignee
Exactech Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Exactech Inc filed Critical Exactech Inc
Publication of EP0606245A1 publication Critical patent/EP0606245A1/fr
Publication of EP0606245A4 publication Critical patent/EP0606245A4/fr
Application granted granted Critical
Publication of EP0606245B1 publication Critical patent/EP0606245B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/3676—Distal or diaphyseal parts of shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30014—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30154—Convex polygonal shapes square
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30158—Convex polygonal shapes trapezoidal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30159—Concave polygonal shapes
    • A61F2002/30179—X-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/3082—Grooves
    • A61F2002/30827—Plurality of grooves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A61F2002/3631—Necks with an integral complete or partial peripheral collar or bearing shoulder at its base
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • A61F2230/0021—Angular shapes square
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • A61F2230/0026—Angular shapes trapezoidal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A61F2230/0058—X-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0029—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in bending or flexure capacity

Definitions

  • the present invention relates generally to cementless total hip. arthroplasty and, more particularly, to an improved press-fit femoral stem prosthesis.
  • press-fit femoral stem prostheses In recent years, cementless total hip arthroplasty has enjoyed significant clinical success. To date, the design of press-fit femoral stem prostheses has focused on providing a tight fit within the metaphyseal portion of the femur to eliminate the potential for relative motion. Prior art femoral stem prostheses generally have a circular or rectangular cross-sectional shape and end abruptly in a blunt tip distally. While some of the prior art femoral stem prostheses have achieved the desired tight fit, two major problems remain associated with press-fit stems: the occurrence of thigh pain and abnormal femoral bone remodeling.
  • the femoral stem prosthesis of the present invention provides multi-plane stability within the femur while substantially eliminating thigh pain.
  • the invention minimizes femoral bone remodeling by providing increased stress transfer in the mid and proximal regions of the prosthesis and by minimizing stress transfer in the distal stem area
  • the inventive prosthesis includes a neck and a stem, the stem being designed to be embedded in the femur of a patient.
  • the stem has a gradual proximal to distal end taper to conform to the geometry of the etaphyseal portion of the femur.
  • the stem includes a secondary zone of taper wherein the stem gradually tapers away from the bone.
  • the stem has a trapezoidal cross-sectional geometry to provide a tight fit within the metaphyseal portion of the femur and to resist rotational forces.
  • the tight fit of the inventive femoral stem prosthesis provides effective stress transfer to the femur and maximum resistance to rotational forces.
  • the inventive prosthesis is preferably composed of a biocompatible material.
  • the stem of the inventive prosthesis is made of a titanium alloy to increase stem flexibility and decrease stress-shielding of the femur. Additionally, the stem of the preferred embodiment is provided with a plurality of longitudinal channels to further reduce its stiffness. Additional features and advantages of the invention will become apparent from the following detailed description read in conjunction with the following drawings.
  • FIGURE la is a side view of the preferred embodiment of the inventive prosthetic stem.
  • FIGURE lb is an enlarged side view of the distal end of FIGURE la.
  • FIGURE lc is an enlarged side view of the distal end of a prior art prosthetic stem.
  • FIGURE 2 is a cross-sectional view of FIGURE 1 taken along lines 2-2.
  • FIGURE 3 is a cross-sectional view of FIGURE 1 taken along lines 3-3.
  • FIGURE 4 is a cross-sectional view of FIGURE 1 taken along lines 4-4.
  • FIGURE la depicts a side view of the preferred embodiment of the inventive femoral stem prosthesis 10.
  • the prosthesis 10 includes a neck 12, a collar 14, and a stem 16.
  • the neck 12, collar 14 and stem 16 are preferably made of a titanium alloy to provide maximum compatibility with the femoral bone and to maximize stem strength and flexibility.
  • other biocompatible materials e.g., ceramics, composites or other metal alloys, having the requisite strength and flexibility may be used.
  • the preferred embodiment of the invention includes a collar, the invention encompasses collarless prostheses.
  • Stem 16 is provided with a gradual proximal to distal end taper.
  • This taper includes a primary zone of taper 18 having an angle of taper ranging from approximately 1° to 2° per side (measured from a center line A-B) preferably approximately 1.5°, designed to conform to the narrowing of the metaphyseal portion of the femur.
  • the distal portion of stem 16 is provided with a secondary zone of taper 22, shown enlarged in FIGURE lb.
  • the stem 16 gradually tapers away from the femoral bone 23 (shown in dotted outline on one side only of the stem 16) .
  • the secondary zone of taper 22 has an angle of taper e ranging from approximately 2° to 4° per side, with respect to the primary zone of taper 18, with larger taper angles for larger, and consequently stiffer, prostheses. 1° greater per side.than the angle of taper of the primary zone of taper 18. That is, if the primary zone taper is 1.5°, then preferably the secondary zone taper is an additional 1°, or 2.5° with respect to the center line A-B.
  • the present invention thus differs from the prior art, shown enlarged in FIGURE lc, which has a first taper 18' that directly transitions to a blunt distal end 22', which results in a sharper transition from the surface of the bone 23.
  • the radius of curvature between the primary zone of taper 18 and the secondary zone of taper 22 at point C ranges from approximately 0.75 to 2.0 inches, being preferably approximately 1.0 inch.
  • the transition from the primary zone 18 to the secondary zone 22 occurs at a point 24 located approximately
  • tapered stem design including the secondary zone of taper 22, provides increased proximal stress transfer and minimizes stress transfer at the distal end 20 of stem 16. The occurrence of thigh pain can thus be substantially eliminated.
  • the stem 16 has a trapezoidal cross-sectional geometry including four substantially flat faces 26 and tour beveled edges 28. It has been determined that the trapezoidal cross-sectional geometry of the stem provides excellent proximal fill of the metaphyseal portion of the femur for optimum stress transfer to the femur. Additionally, this cross-sectional geometry provides maximum resistance to rotational forces.
  • the stem 16 of the preferred embodiment of the present invention is provided with a longitudinal channel 30 in each face 26.
  • the channels 30, preferably extend along at least the distal--half of the stem and more preferably along approximately 55% of the stem length.
  • the length of the channels ranges from approximately 3 to 4 inches, depending on the size of the prosthesis 10.
  • the depth of the channels 30 ranges from approximately 0.05 to 0.15 inch, while the diameter of the channels 30 ranges from approximately 0.10 to 0.30 inch, depending on the size of the prosthesis 10.
  • the channels 30 yield an increase in flexibility of the stem 16 of approximately 5-20% compared to non-channeled stems (preferably 16-19% in larger sized prostheses) , thereby reducing the distal stem stress transfer.
  • the channel exit radius of curvature is preferably approximately 1.5 to 2.5 inches.
  • other radii of curvature may be used, provided the transition from channeled to non-channeled stem is gentle.
  • the presence of channels 30 is particularly desirable in large size femoral stem prostheses, the stiffness of which would otherwise lead to significant stress-shielding of the femur with resulting bone resorption.
  • provision of channels 30 may not be necessary since the stem material alone provides the desired flexibility.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

Une prothèse fémorale (10) comprend une tige (16) se rétrécissant de l'extrémité proximale à l'extrémité distale (20), et une zone primaire (18) et une zone secondaire (22) de rétrécissement. Cette dernière, située à l'extrémité distale (20) de la tige (16), comporte un angle de rétrécissement supérieur à celui de la zone de rétrécissement primaire (18) mais nettement inférieur à celui des tiges utilisées actuellement. Dans la zone secondaire de rétrécissement (22), la tige (16) se rétrécit progressivement à partir du fémur (23) pour éviter une variation brutale du niveau de contrainte appliqué à l'os (23) à l'extrémité distale de la tige, ce qui évite l'apparition de douleurs dans la cuisse. La tige de la prothèse inventée (10) comporte de préférence des évidements longitudinaux (30) qui en augmentent la souplesse, et présente de préférence une section de géométrie trapézoïdale pour résister aux forces de torsion et offrir une stabilité multiplan au fémur, ce qui permet de lui tranférer les efforts efficacement.
EP92918636A 1991-10-04 1992-08-11 Prothese femorale Expired - Lifetime EP0606245B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/771,773 US5152799A (en) 1991-10-04 1991-10-04 Prosthetic femoral stem
US771773 1991-10-04
PCT/US1992/006694 WO1993006794A1 (fr) 1991-10-04 1992-08-11 Prothese femorale

Publications (3)

Publication Number Publication Date
EP0606245A1 true EP0606245A1 (fr) 1994-07-20
EP0606245A4 EP0606245A4 (fr) 1995-02-22
EP0606245B1 EP0606245B1 (fr) 1998-05-20

Family

ID=25092932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92918636A Expired - Lifetime EP0606245B1 (fr) 1991-10-04 1992-08-11 Prothese femorale

Country Status (6)

Country Link
US (1) US5152799A (fr)
EP (1) EP0606245B1 (fr)
KR (1) KR100236676B1 (fr)
DE (1) DE69225600T2 (fr)
ES (1) ES2119819T3 (fr)
WO (1) WO1993006794A1 (fr)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9201734D0 (en) * 1992-01-28 1992-03-11 Howmedica Femoral component for use in a replacement hip prosthesis
DE4315143C1 (de) * 1993-05-07 1994-12-08 S & G Implants Gmbh Oberschenkelteil einer Hüftgelenk-Endoprothese
FR2720268B1 (fr) * 1994-05-24 1996-10-25 Implants Orthopediques Toutes Tige fémorale pour prothèse de hanche.
US5653765A (en) * 1994-07-01 1997-08-05 Ortho Development Corporation Modular prosthesis
US5683467A (en) * 1994-11-28 1997-11-04 Biomedical Engineering Trust I Prosthesis with articulating surface stress reducing contact edge
FR2744628B1 (fr) * 1996-02-08 1998-04-17 Deckner Andre Georges Tige d'ancrage de prothese
DE19610729A1 (de) * 1996-03-19 1997-09-25 Franz Prof Dr Med Copf Prothesenteil
US20040010319A1 (en) * 1998-04-14 2004-01-15 Osteoimplant Technology Inc. Intrinsic stability in a total hip stem
US7323013B2 (en) * 1998-04-14 2008-01-29 Encore Medical Asset Corporation Differential porosity prosthetic hip system
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Also Published As

Publication number Publication date
KR940702355A (ko) 1994-08-20
WO1993006794A1 (fr) 1993-04-15
EP0606245B1 (fr) 1998-05-20
DE69225600D1 (de) 1998-06-25
US5152799A (en) 1992-10-06
DE69225600T2 (de) 1999-02-11
EP0606245A4 (fr) 1995-02-22
KR100236676B1 (ko) 2001-11-22
ES2119819T3 (es) 1998-10-16

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